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本文应用电流扫描极谱法及计时电位法,对邻菲罗啉及其衍生物萃取Fe~(2+)的机理进行了探讨。认为是萃取剂从有机相中扩散到水相中,与Fe~(2+)形成配合物。出现的双波是由于配合物及萃取剂质子化后迁移的结果。证明了配合物迁移波是动力学控制的,萃取剂质子化波是由萃取剂扩散所控制的。求出了配求出其K_f=(3.75 1.65位比为:Fe~(2+)(萃取剂)=1:3。对于决速步骤:求出其K_f=(3.75±1.65)×10~6 1·mol~(-1)s~(-1)。
In this paper, the current scanning polarography and chronopotentiometry were used to investigate the mechanism of Fe2 + in phenanthroline and its derivatives. It is believed that the extractant diffuses into the aqueous phase from the organic phase and forms a complex with Fe ~ (2+). The appearance of the double wave is due to the migration of the complex and extractant after protonation. It is proved that the wave of complex migration is kinetics controlled and the protonation wave of extractant is controlled by the diffusion of extractant. Find out the K_f = (3.75 1.65 bit ratio: Fe ~ (2 +) (extractant) = 1: 3. For the speed step: Find its K_f = (3.75 ± 1.65) × 10 ~ 6 1 · mol ~ (-1) s ~ (-1).